diff --git a/[refs] b/[refs]
index 07e55a350ac7..8e8f7cdd0047 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 21c935e5298a3bc4f16cdff7ce3b1efab92b995e
+refs/heads/master: e27e80b3da7ad6b90185bd689879888907104a40
diff --git a/trunk/arch/um/include/os.h b/trunk/arch/um/include/os.h
index 120ca21a513a..6516f6dca96d 100644
--- a/trunk/arch/um/include/os.h
+++ b/trunk/arch/um/include/os.h
@@ -201,6 +201,7 @@ extern int os_getpgrp(void);
 
 #ifdef UML_CONFIG_MODE_TT
 extern void init_new_thread_stack(void *sig_stack, void (*usr1_handler)(int));
+extern void stop(void);
 #endif
 extern void init_new_thread_signals(void);
 extern int run_kernel_thread(int (*fn)(void *), void *arg, void **jmp_ptr);